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Wilis Ari Setyati - One of the best experts on this subject based on the ideXlab platform.
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bioaktivitas ekstrak dan serbuk lamun enhalus acoroides dan Thalassia hemprichii pada vibrio alginolyticus dan vibrio harveyii
ILMU KELAUTAN: Indonesian Journal of Marine Sciences, 2012Co-Authors: Ita Riniatsih, Wilis Ari SetyatiAbstract:Vibriosis merupakan penyakit bakterial yang menyerang udang antara lain disebabkan oleh Vibrio alginolyticus dan Vibrio harveyii . Salah satu upaya perlindungan udang terhadap infeksi vibriosis adalah melalui reduksi jumlah bakteri vibrio di media budidaya dan saluran pencernaan udang. Penelitian ini bertujuan untuk mendapatkan justifikasi pemanfaatan ekstrak dan serbuk simplisia lamun Enhalus acoroides dan Thalassia hemprichii sebagai agensia pengendali bakteri vibrio. Beberapa penelitian membuktikan bahwa lamun mempunyai aktivitas antibakteri. Oleh karena itu perlu dilakukan pengujian jenis lamun lain dan terhadap strain strain bakteri vibrio pathogenik pada udang. Penelitian dilakukan dengan metode eksperimental. Sampel E. acoroides dan T. hemprichii diekstraksi dengan air panas. Pengujian aktivitas antibakteri dilakukan secara in vitro menggunakan agar disc diffusion method. Hasil penelitian menunjukan bahwa ekstrak dan serbuk simplisia E. acoroides tidak menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii . Ekstrak T. hemprichii menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii. Sedangkan serbuk simplisia T. hemprichii menunjukan aktivitas antibakteri terhadap V. alginolyticus dan V. harveyii setelah 48 jam inkubasi Kata kunci : antibakteri, ektrak panas, serbuk, lamun, vibriosis Vibriosis is a bacterial diseases in prawn which caused by Vibrio including Vibrio alginolyticus and Vibrio harveyii . An effort to protect the prawn of vibrio infection is by reducing the number of vibrio bacteria either in the culture media and/or in the gastrointestinal system of the cultured species. The research aimed to find justification for the use of seagrasess Enhalus acoroides and Thalassis hemprichii as vibrio bacteria control agensia. The research was conducted by experimental method. The initial phase of the study was testing the antibacterial activity in vitro using agar disc diffusion method. The result shows that neither extract nor simplicia of E. acoroides have an effect against the growth of V. alginolyticus and V. Extract of however, significantly shows bioactivity respond against those bacteria and its simplicia powder also showing a similar effect but after 48 hours of incubation. Key words : antibacterial, hot water extract, powder, seagrass, vibriosis
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bioaktivitas ekstrak dan serbuk lamun enhalus acoroides dan Thalassia hemprichii pada vibrio alginolyticus dan vibrio harveyii
ILMU KELAUTAN: Indonesian Journal of Marine Sciences, 2012Co-Authors: Ita Riniatsih, Wilis Ari SetyatiAbstract:Vibriosis merupakan penyakit bakterial yang menyerang udang antara lain disebabkan oleh Vibrio alginolyticus dan Vibrio harveyii . Salah satu upaya perlindungan udang terhadap infeksi vibriosis adalah melalui reduksi jumlah bakteri vibrio di media budidaya dan saluran pencernaan udang. Penelitian ini bertujuan untuk mendapatkan justifikasi pemanfaatan ekstrak dan serbuk simplisia lamun Enhalus acoroides dan Thalassia hemprichii sebagai agensia pengendali bakteri vibrio. Beberapa penelitian membuktikan bahwa lamun mempunyai aktivitas antibakteri. Oleh karena itu perlu dilakukan pengujian jenis lamun lain dan terhadap strain strain bakteri vibrio pathogenik pada udang. Penelitian dilakukan dengan metode eksperimental. Sampel E. acoroides dan T. hemprichii diekstraksi dengan air panas. Pengujian aktivitas antibakteri dilakukan secara in vitro menggunakan agar disc diffusion method. Hasil penelitian menunjukan bahwa ekstrak dan serbuk simplisia E. acoroides tidak menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii . Ekstrak T. hemprichii menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii. Sedangkan serbuk simplisia T. hemprichii menunjukan aktivitas antibakteri terhadap V. alginolyticus dan V. harveyii setelah 48 jam inkubasi Kata kunci : antibakteri, ektrak panas, serbuk, lamun, vibriosis Vibriosis is a bacterial diseases in prawn which caused by Vibrio including Vibrio alginolyticus and Vibrio harveyii . An effort to protect the prawn of vibrio infection is by reducing the number of vibrio bacteria either in the culture media and/or in the gastrointestinal system of the cultured species. The research aimed to find justification for the use of seagrasess Enhalus acoroides and Thalassis hemprichii as vibrio bacteria control agensia. The research was conducted by experimental method. The initial phase of the study was testing the antibacterial activity in vitro using agar disc diffusion method. The result shows that neither extract nor simplicia of E. acoroides have an effect against the growth of V. alginolyticus and V. Extract of however, significantly shows bioactivity respond against those bacteria and its simplicia powder also showing a similar effect but after 48 hours of incubation. Key words : antibacterial, hot water extract, powder, seagrass, vibriosis
Ita Riniatsih - One of the best experts on this subject based on the ideXlab platform.
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bioaktivitas ekstrak dan serbuk lamun enhalus acoroides dan Thalassia hemprichii pada vibrio alginolyticus dan vibrio harveyii
ILMU KELAUTAN: Indonesian Journal of Marine Sciences, 2012Co-Authors: Ita Riniatsih, Wilis Ari SetyatiAbstract:Vibriosis merupakan penyakit bakterial yang menyerang udang antara lain disebabkan oleh Vibrio alginolyticus dan Vibrio harveyii . Salah satu upaya perlindungan udang terhadap infeksi vibriosis adalah melalui reduksi jumlah bakteri vibrio di media budidaya dan saluran pencernaan udang. Penelitian ini bertujuan untuk mendapatkan justifikasi pemanfaatan ekstrak dan serbuk simplisia lamun Enhalus acoroides dan Thalassia hemprichii sebagai agensia pengendali bakteri vibrio. Beberapa penelitian membuktikan bahwa lamun mempunyai aktivitas antibakteri. Oleh karena itu perlu dilakukan pengujian jenis lamun lain dan terhadap strain strain bakteri vibrio pathogenik pada udang. Penelitian dilakukan dengan metode eksperimental. Sampel E. acoroides dan T. hemprichii diekstraksi dengan air panas. Pengujian aktivitas antibakteri dilakukan secara in vitro menggunakan agar disc diffusion method. Hasil penelitian menunjukan bahwa ekstrak dan serbuk simplisia E. acoroides tidak menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii . Ekstrak T. hemprichii menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii. Sedangkan serbuk simplisia T. hemprichii menunjukan aktivitas antibakteri terhadap V. alginolyticus dan V. harveyii setelah 48 jam inkubasi Kata kunci : antibakteri, ektrak panas, serbuk, lamun, vibriosis Vibriosis is a bacterial diseases in prawn which caused by Vibrio including Vibrio alginolyticus and Vibrio harveyii . An effort to protect the prawn of vibrio infection is by reducing the number of vibrio bacteria either in the culture media and/or in the gastrointestinal system of the cultured species. The research aimed to find justification for the use of seagrasess Enhalus acoroides and Thalassis hemprichii as vibrio bacteria control agensia. The research was conducted by experimental method. The initial phase of the study was testing the antibacterial activity in vitro using agar disc diffusion method. The result shows that neither extract nor simplicia of E. acoroides have an effect against the growth of V. alginolyticus and V. Extract of however, significantly shows bioactivity respond against those bacteria and its simplicia powder also showing a similar effect but after 48 hours of incubation. Key words : antibacterial, hot water extract, powder, seagrass, vibriosis
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bioaktivitas ekstrak dan serbuk lamun enhalus acoroides dan Thalassia hemprichii pada vibrio alginolyticus dan vibrio harveyii
ILMU KELAUTAN: Indonesian Journal of Marine Sciences, 2012Co-Authors: Ita Riniatsih, Wilis Ari SetyatiAbstract:Vibriosis merupakan penyakit bakterial yang menyerang udang antara lain disebabkan oleh Vibrio alginolyticus dan Vibrio harveyii . Salah satu upaya perlindungan udang terhadap infeksi vibriosis adalah melalui reduksi jumlah bakteri vibrio di media budidaya dan saluran pencernaan udang. Penelitian ini bertujuan untuk mendapatkan justifikasi pemanfaatan ekstrak dan serbuk simplisia lamun Enhalus acoroides dan Thalassia hemprichii sebagai agensia pengendali bakteri vibrio. Beberapa penelitian membuktikan bahwa lamun mempunyai aktivitas antibakteri. Oleh karena itu perlu dilakukan pengujian jenis lamun lain dan terhadap strain strain bakteri vibrio pathogenik pada udang. Penelitian dilakukan dengan metode eksperimental. Sampel E. acoroides dan T. hemprichii diekstraksi dengan air panas. Pengujian aktivitas antibakteri dilakukan secara in vitro menggunakan agar disc diffusion method. Hasil penelitian menunjukan bahwa ekstrak dan serbuk simplisia E. acoroides tidak menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii . Ekstrak T. hemprichii menunjukan bioaktivitas terhadap V. alginolyticus dan V. harveyii. Sedangkan serbuk simplisia T. hemprichii menunjukan aktivitas antibakteri terhadap V. alginolyticus dan V. harveyii setelah 48 jam inkubasi Kata kunci : antibakteri, ektrak panas, serbuk, lamun, vibriosis Vibriosis is a bacterial diseases in prawn which caused by Vibrio including Vibrio alginolyticus and Vibrio harveyii . An effort to protect the prawn of vibrio infection is by reducing the number of vibrio bacteria either in the culture media and/or in the gastrointestinal system of the cultured species. The research aimed to find justification for the use of seagrasess Enhalus acoroides and Thalassis hemprichii as vibrio bacteria control agensia. The research was conducted by experimental method. The initial phase of the study was testing the antibacterial activity in vitro using agar disc diffusion method. The result shows that neither extract nor simplicia of E. acoroides have an effect against the growth of V. alginolyticus and V. Extract of however, significantly shows bioactivity respond against those bacteria and its simplicia powder also showing a similar effect but after 48 hours of incubation. Key words : antibacterial, hot water extract, powder, seagrass, vibriosis
Wang Hankui - One of the best experts on this subject based on the ideXlab platform.
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a primary study on sexual reproduction of seagrass Thalassia hemprichii at xincun bay
Journal of Tropical Oceanography, 2008Co-Authors: Wang HankuiAbstract:Reconstruction methods were employed to estimate the flowering and seedling efficiency of seagrass Thalassia hemprichii at the Xincun bay of Hainan Island.The results revealed that Thalassia hemprichii initiated flowers in early November and the seedlings appeared in late February next year,which were nearly two months earlier than the population in Philippine did.The ratio of female to male flowers was 1∶4.It was observed that only 0.95% of Thalassia hemprichii shoots produced flowers at this time.
Macreadie Peter - One of the best experts on this subject based on the ideXlab platform.
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Effects of small‐scale, shading‐induced seagrass loss on blue carbon storage: Implications for management of degraded seagrass ecosystems
'Wiley', 2018Co-Authors: Trevathan-tackett, Stacey M., Wessel Caitlin, Cebrian Just, Ralph, Peter J., Masque´ Pere, Macreadie PeterAbstract:Seagrass meadows are important global blue carbon sinks. Despite a 30% loss of seagrasses globally during the last century, there is limited empirical research investigating the effects of disturbance and loss of seagrass on blue carbon stocks. In this study, we hypothesised that seagrass loss would reduce blue carbon stocks. Using shading cloth, we simulated small‐scale die‐offs of two subtropical seagrass species, Halodule wrightii and Thalassia testudinum, in a dynamic northern Gulf of Mexico lagoon. The change in quantity and quality of sediment organic matter (OM) and organic carbon was compared among die‐off, control and bare plots before the die‐off treatment, shortly after the die‐off treatment and 11 months after the die‐off treatment. 210Pb age dating was performed on bare and Thalassia plots at 11 months to evaluate the impact of sediment erosion in the absence of vegetation. The small‐scale die‐off led to a 50%–65% OM loss in the sediment in the top 8 cm of Halodule plots. Thalassia plots lost significant portions of OM (50%) and organic carbon (Corg; 21%–47%) in only the top 1 cm of sediment. The 210Pb profiles indicated Thalassia die‐off reduced the Corg sequestration rate by 10%, in addition to a loss of c. 1 year\u27s worth of Corg stocks (c. 22 g/m2). Furthermore, analyses on OM/Corg quality indicated a loss of labile OM/Corg and enhanced remineralisation by microbes. Synthesis and applications. This study provides empirical evidence that small‐scale shading‐induced seagrass die‐offs can reduce seagrass carbon sequestration capacity and trigger losses of blue carbon stocks. While the losses recorded here are modest, these losses in blue carbon storage capacity are notable due to the proximity of shading structures (e.g. boat docks) to seagrass habitats. Thus, policies to avoid or protect seagrass habitats from common small‐scale, shading disturbances are important for optimising both carbon sequestration capacity and coastline development and management
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Data from: Effects of small-scale, shading-induced seagrass loss on blue carbon storage: Implications for management of degraded seagrass ecosystems
2017Co-Authors: Trevathan-tackett, Stacey M., Wessel Caitlin, Cebrian Just, Ralph, Peter J., Masque Pere, Macreadie PeterAbstract:1. Seagrass meadows are important global ‘blue carbon’ sinks. Despite a 30% loss of seagrasses globally during the last century, there is limited empirical research investigating the effects of disturbance and loss of seagrass on blue carbon stocks. 2. In this study, we hypothesised that seagrass loss would reduce blue carbon stocks. Using shading cloth, we simulated small-scale die-offs of two subtropical seagrass species, Halodule wrightii and Thalassia testudinum, in a dynamic northern Gulf of Mexico lagoon. The change in quantity and quality of sediment organic matter and organic carbon were compared among kill, control and bare plots before the kill treatment, shortly after the kill treatment and 11 months after the kill treatment. 210 Pb age dating was performed on bare and Thalassia plots at 11 months to evaluate the impact of sediment erosion in the absence of vegetation. 3. The small-scale die-off led to a 50-65% organic matter (OM) loss in the sediment in the top 8 cm of Halodule plots. Thalassia plots lost significant portions OM (50%) and organic carbon (C; 21-47%) in only the top 1 cm of sediment. The 210 Pb profiles indicated Thalassia die-off reduced the C sequestration rate by 10%, in addition to a loss of ~1 years’ worth of C stocks (~22 g m-2
Marten A Hemminga - One of the best experts on this subject based on the ideXlab platform.
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biomass loss and nutrient redistribution in an indonesian Thalassia hemprichii seagrass bed following seasonal low tide exposure during daylight
Marine Ecology Progress Series, 1997Co-Authors: Johan Stapel, R Manuntun, Marten A HemmingaAbstract:The intertidal reef flat of Barang Lompo Island, Indonesia, is exposed to air for several hours per day on the days around spring tides. The time of exposure shows a seasonal pattern. In the period January-June, the reef flat only runs dry at night, whereas in the period July-December, exposure only occurs during daylight. During the low tide daylight exposure period of July-December 1993, the leaf and rhizome biomasses (g m(-2)) declined significantly by 61 and 37%, respectively. Total rhizome length remained unchanged. C- and P-concentrations (% of dry weight) of leaves showed no change, while the leaf N- concentration increased by 25%. C-, N- and P-contents of leaves showed a decline that was strongly correlated to leaf biomass decline. In the rhizomes, C-concentration declined by 8%, but the N- and P-concentrations increased by 111 and 25%, respectively. Rhizome C-content (g m(-2)) declined (43%), N- content increased (46%) and P-content did not change. Total C- and P-contents of the summed biomass of leaves and rhizomes declined by 46 and 34%, respectively, but N-content showed no change. Ammonium and phosphate concentrations in the water column and pore water phosphate were not significantly different during daylight exposure compared to during nocturnal exposure. Ammonium concentration in the pore water, however, was 1.6 times higher during daylight exposure. Results show that during a period of frequent daylight exposure, the nutrient status in the intertidal Thalassia hemprichii seagrass bed changed considerably. Despite biomass reduction, the total nitrogen content in leaves and rhizomes together was constant, which was achieved by an enhanced nitrogen accumulation in the rhizomes. Two theories possibly responsible for the stable sum of the total leaf and rhizome nitrogen content are discussed. The first theory describes the seagrass bed as a relatively closed system with respect to nutrient cycles: detached leaf fragments remain trapped within the meadow. The second theory postulates that the loss of part of the photosynthesising canopy due to daylight exposure has a series of consequences for microbial N-transformation processes in the sediment, which indirectly affects the plants' nitrogen status. This study shows that Thalassia hemprichii, covering the reef flat of an intertidal tropical offshore coral island, which is often considered as a nutrient-poor environment, is rather resilient to a significant canopy die-off and concomitant nutrient losses. [KEYWORDS: daylight exposure; seagrass; biomass redistribution; nutrient contents; Thalassia hemprichii; Indonesia South sulawesi indonesia; banks ex konig; cymodocea-nodosa; syringodium filiforme; terrigenous sediments; zostera capricorni; halodule-wrightii; leaf growth; testudinum; carbonate]
